Over time the heavy flaps of skin can hang down over eyes, obscure vision and cause the eyelids to roll inward, scratching the cornea and causing intense irritation and potential blindness. (petguide.com)
The action is spastic and impossible to follow and so Norrington, logically, twice stages three separate incomprehensible fights simultaneously (in the proud George Lucas tradition) so as to induce nausea and intense irritation. (filmfreakcentral.net)